Numbering paragraphs with CSS

https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Lists_and_Counters/Using_CSS_counters

.chapter {
    counter-reset: paragraph;
    padding-left: 20px;
}
.page p {
    width: 400px;
}
.page p:before {
    position: absolute;
    margin-left: -20px;
    color: #CCC;
    content: counter(paragraph);
    counter-increment: paragraph;
}

https://stackoverflow.com/questions/6244591/css-styled-paragraphs-with-paragraph-numbering-and-sidenotes#6245291